CN114038426B - Display driving method, touch driving method, chip and terminal of display screen - Google Patents

Display driving method, touch driving method, chip and terminal of display screen Download PDF

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Publication number
CN114038426B
CN114038426B CN202111520843.0A CN202111520843A CN114038426B CN 114038426 B CN114038426 B CN 114038426B CN 202111520843 A CN202111520843 A CN 202111520843A CN 114038426 B CN114038426 B CN 114038426B
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display
signal
level
touch
level duration
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CN114038426A (en
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胡盛棚
吴安平
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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Guangdong Oppo Mobile Telecommunications Corp Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
    • G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
    • G06F3/0416—Control or interface arrangements specially adapted for digitisers
    • G06F3/04166—Details of scanning methods, e.g. sampling time, grouping of sub areas or time sharing with display driving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/06—Handling electromagnetic interferences [EMI], covering emitted as well as received electromagnetic radiation

Abstract

The application belongs to the technical field of display screens, and particularly relates to a display driving method, a touch driving method, a chip and a terminal of a display screen.

Description

Display driving method, touch driving method, chip and terminal of display screen
Technical Field
The application belongs to the technical field of display screens, and particularly relates to a display driving method, a touch driving method, a chip and a terminal of a display screen.
Background
The display screen with the touch function can enable a user to operate the terminal in a touch mode, so that human-computer interaction is more straightforward.
However, in the display screen, during the display scanning and the touch scanning, the touch scanning signal of the display screen may generate electromagnetic interference to the display process of the display screen, so that the display quality of the display screen is affected.
Disclosure of Invention
The embodiment of the application provides a display driving method, a touch driving method, a chip and a terminal of a display screen, which can avoid electromagnetic interference generated by a touch scanning signal of the display screen on the display process of the display screen and improve the display quality of the display screen.
A first aspect of the embodiments of the present application provides a display driving method for a display screen, where the display driving method is applied to a display driving chip of the display screen, and the display driving method includes:
generating a display scanning signal, a display data signal and a line synchronization signal; wherein, the level duration corresponding to the display data in the display data signal is within the effective level duration of the display scanning signal; the active level duration period of the row sync signal includes consecutive first and second level duration periods, the first level duration period being separated from the active level duration period of the display scan signal, the second level duration period coinciding with the active level duration period of the display scan signal;
sending the line synchronization signal to a touch driving chip of the display screen so that the touch driving chip generates a touch scanning signal according to the line synchronization signal; and the rising edge and the falling edge of the touch scanning signal are both positioned in the first level duration time of the row synchronizing signal.
A second aspect of the embodiments of the present application provides a touch driving method for a display screen, which is applied to a touch driving chip of the display screen, and the touch driving method includes:
receiving a line synchronization signal sent by a display driving chip of the display screen; the active level duration time period of the row synchronizing signal comprises a first continuous level duration time period and a second continuous level duration time period, the first continuous level duration time period is separated from the active level duration time period of the display scanning signal generated by the display driving chip, the second continuous level duration time period is overlapped with the active level duration time period of the display scanning signal, and the level duration time period corresponding to the display data in the display data signal generated by the display driving chip is positioned in the active level duration time period of the display scanning signal;
generating a touch scanning signal according to the line synchronization signal; and the rising edge and the falling edge of the touch scanning signal are both positioned in the first level duration time of the row synchronizing signal.
A third aspect of the embodiments of the present application provides a display driver chip, where the display driver chip is configured on a display screen, and the display driver chip is configured to:
generating a display scanning signal, a display data signal and a line synchronizing signal; wherein, the level duration corresponding to the display data in the display data signal is within the active level duration of the display scanning signal; the active level duration period of the row sync signal includes a first level duration period and a second level duration period which are consecutive, the first level duration period being separated from the active level duration period of the display scan signal, the second level duration period coinciding with the active level duration period of the display scan signal;
sending the line synchronization signal to a touch driving chip of the display screen so that the touch driving chip generates a touch scanning signal according to the line synchronization signal; and the rising edge and the falling edge of the touch scanning signal are both positioned in the first level duration time of the row synchronizing signal.
A fourth aspect of the embodiments of the present application provides a touch driving chip, where the touch driving chip is configured on a display screen, and the touch driving chip is configured to:
receiving a line synchronization signal sent by a display driving chip of the display screen; the active level duration time period of the row synchronizing signal comprises a first continuous level duration time period and a second continuous level duration time period, the first continuous level duration time period is separated from the active level duration time period of the display scanning signal generated by the display driving chip, the second continuous level duration time period is overlapped with the active level duration time period of the display scanning signal, and the level duration time period corresponding to the display data in the display data signal generated by the display driving chip is positioned in the active level duration time period of the display scanning signal;
generating a touch scanning signal according to the line synchronization signal; and the rising edge and the falling edge of the touch scanning signal are both positioned in the first level duration time of the row synchronizing signal.
A fifth aspect of the embodiments of the present application provides a display screen, the display screen is configured with a display driver chip and a touch driver chip, the display driver chip is connected to the touch driver chip, the display driver chip is configured to implement the steps of the display driver method according to the first aspect, the touch driver chip is configured to implement the steps of the touch driver method according to the second aspect, and the display screen displays an image based on the display scanning signal, the display data signal, and the line synchronization signal, and implements a touch function based on the touch scanning signal.
A sixth aspect of the embodiments of the present application provides a terminal, the terminal includes a processor, a memory, and a display screen configured with a display driver chip and a touch driver chip, the processor respectively with the display driver chip with the touch driver chip is connected, the display driver chip is used for implementing the steps of the display driving method according to the first aspect, and the touch driver chip is used for implementing the steps of the touch driver method according to the second aspect.
A seventh aspect of embodiments of the present application provides a computer-readable storage medium, where a computer program is stored, and the computer program, when executed, implements the steps of the display driving method according to the first aspect and/or the steps of the touch driving method according to the second aspect.
In the embodiment of the application, a display data signal that a level duration corresponding to display data is within an effective level duration of a display scanning signal is generated by a display driving chip, a first level duration is separated from the effective level duration of the display scanning signal, a line synchronization signal that a second level duration coincides with the effective level duration of the display scanning signal is generated, and the line synchronization signal is sent to the touch driving chip, so that the touch driving chip can generate a touch scanning signal that a rising edge and a falling edge are both within the first level duration of the line synchronization signal according to the line synchronization signal, thereby realizing mutual separation of a display timing sequence and a touch timing sequence of a display screen, and enabling the display driving chip to be free from interference of the touch scanning signal generated by the touch driving chip when performing image display based on the display scanning signal and the display data signal, thereby improving the display quality of the display screen.
Drawings
In order to more clearly describe the display driving method and the touch driving method of the display screen according to the embodiment of the present application, the drawings required in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings may be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a display driving circuit provided in an embodiment of the present application;
fig. 2 is a schematic diagram of a touch driving circuit structure according to an embodiment of the present disclosure;
fig. 3 is a schematic diagram of a first signal timing sequence of a display driving method and a touch driving method of a display screen according to an embodiment of the present disclosure;
fig. 4 is a schematic flow chart illustrating an implementation process of a display driving method of a display screen according to an embodiment of the present application;
FIG. 5 is a schematic signal timing diagram illustrating a display driving method of a display panel according to the related art provided by an embodiment of the present application;
fig. 6 is a schematic flow chart illustrating an implementation of a touch driving method for a display screen according to an embodiment of the present application;
fig. 7 is a schematic diagram of a second signal timing sequence of the display driving method and the touch driving method of the display screen according to the embodiment of the present application;
fig. 8 is a schematic structural diagram of a terminal according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
"and/or" herein is merely an association describing an associated object, and means that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, in the description of the embodiments of the present application, "a plurality" means two or more, and "at least one", "one or more" means one, two or more, unless otherwise specified.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
For the sake of easy understanding, terms referred to in the embodiments of the present application will be described below.
The line synchronizing signal, i.e. Hsync signal, is generated by a display driving chip of the display screen, and when the Hsync signal is valid, it indicates that the signal received by the display screen belongs to the signal of the same line of pixels.
The display scan signal, i.e., the Gate signal, is a row switch signal, and is used to control a Source (Source) voltage or current to enter a channel of a current row of pixel circuits, so as to implement data refresh of the current row of pixels.
The display data signal, i.e. the Source signal, belongs to the column data signal, and is used for outputting a driving voltage or a driving current to realize data refreshing of each pixel in the row where the Gate signal is located.
The display screen with the touch control function refers to a display screen with a touch control function and a display function, and the display screen integrates a touch layer and a touch drive chip.
In this embodiment, the display screen may be an organic light emitting diode display screen (OLED display screen) or a liquid crystal display screen (LCD display screen) or other different types of display screens. In addition, in the display panel, two electrodes of the pixels can be made into a matrix structure, N row electrodes and M column electrodes are formed, and pixels are lit row by adopting a row-by-row scanning mode. The specific implementation mode is as follows: and circularly applying a pulse to each row electrode, and simultaneously providing the driving current or the driving voltage for the pixels of the row by all the column electrodes so as to realize the display of each sub-pixel of one row, and completing the scanning of all the rows to realize the display of one frame of image.
For example, as shown in fig. 1, a schematic diagram of a Display driving Circuit structure of an LCD panel provided in this embodiment of the present application shows 4 Display scan lines in total for G1-G4, and 7 Display data lines in total for S1-S7, where each Display scan line is connected to one row of sub-pixels (as shown in fig. 1, A1 is one sub-pixel in one row of sub-pixels connected to the Display scan line G1), specifically, connected to a Gate of a TFT, and each data line is connected to one column of sub-pixels, specifically, connected to a Source of the TFT and further connected to a pixel electrode, a Gate signal is input to each scan line (i.e., a driving current is output to each row of sub-pixels) through a Display Driver Integrated Circuit (DDIC) of the Display panel, so that the TFT of each sub-pixel is powered on, and a Source signal is input to each data line (i.e., a driving voltage is output to each column of sub-pixels) through the DDIC, so as to illuminate each row of sub-pixels, and obtain a Display image.
In addition, as shown in fig. 2, the display screen may further include a plurality of Touch scan lines TX1-TX8 and Touch sense lines RX1-RX8 distributed in rows and columns, a Touch driving chip (TPIC) is used to input Touch scan signals to the Touch scan lines line by line, and the TPIC is used to receive Touch sense signals returned from the Touch sense lines, so as to determine a specific position of a Touch operation occurring on the display screen according to the Touch sense signals.
As can be seen from the above description, when the display screen displays an image, high frequency signals for displaying the image, such as a line synchronization signal, a display scanning signal, and a display data signal, are generated, and during the touch scanning, a high frequency touch scanning signal is also generated. In practical applications, when there is an overlap between the time sequences of the touch scanning signal and the display data signal, a problem that the touch scanning signal of the display screen generates electromagnetic interference to a display process of the display screen easily occurs, and the display quality of the display screen is affected.
In order to solve the above problems, in the related art, a scheme of changing the touch scanning frequency and synchronizing the display and the touch may be adopted, so as to avoid the problem that the touch scanning signal of the display screen generates electromagnetic interference to the display process of the display screen.
The method is ineffective for the display screen which cannot find the touch scanning frequency with less interference, and even if the touch scanning frequency with less interference can be found, the touch scanning performance of the display screen can be reduced due to the fact that the touch scanning frequency is selected to carry out touch scanning on the display screen.
For example, the touch scanning frequency is low, which causes a problem that the display screen has no response or slow response to touch, and in addition, when the touch scanning frequency is selected to perform touch scanning on the display screen, electromagnetic interference may be generated on electrical components (for example, the near field communication chip NFC) other than the display screen.
Therefore, the problem that the touch scanning signal of the display screen generates electromagnetic interference to the display process of the display screen is avoided by changing the touch scanning frequency, and the limitation is large.
In the method of synchronizing display and touch, a vertical synchronization signal Vsync for frame synchronization is usually sent to the TPIC by the DDIC, so that the TPIC performs touch scanning with the vertical synchronization signal Vsync as a synchronization reference, in this case, if the display screen performs image refresh with a low refresh rate, for example, the refresh rate of 1Hz or 10Hz, the touch scanning frequency of the TPIC also becomes 1Hz or 10Hz, which causes the touch scanning frequency of the TPIC to be too low, and further causes the display screen to have a problem of no touch response or slow response.
Therefore, the display and touch synchronization method is only suitable for a single-frequency or dual-frequency display screen, for example, a display screen performing image refresh at a refresh rate of 120Hz, or a display screen performing image refresh at refresh rates of 120Hz and 60Hz, but cannot be applied to a display screen performing image refresh at multiple refresh rates, or a display screen using a dynamic frequency conversion technology has a narrow application range.
Therefore, the problem that the touch scanning signal of the display screen generates electromagnetic interference to the display process of the display screen cannot be well solved by the current technical scheme.
Based on this, an embodiment of the present application provides a display driving method, a touch driving method, a chip, and a terminal for a display screen, as shown in fig. 3, a display data signal is generated by a DDIC, where a level duration period corresponding to display data is within an effective level duration period of a display scan signal, a first level duration period is generated to be separated from the effective level duration period of the display scan signal, a line synchronization signal is generated, where a second level duration period coincides with the effective level duration period of the display scan signal, and the line synchronization signal is sent to the TPIC, so that the TPIC can generate a touch scan signal, where a rising edge and a falling edge are both within the first level duration period of the line synchronization signal according to the line synchronization signal, and thus, the display timing and the touch timing of the display screen are separated from each other, and when the DDIC performs image display based on the display scan signal and the display data signal, the DDIC is not interfered by the touch scan signal generated by the TPIC, and the display quality of the display screen is improved.
Specifically, because the time periods corresponding to the rising edge and the falling edge of the touch scanning signal belong to the time periods in which the voltage changes, the time periods are the main time periods in which the electromagnetic interference is generated, and the high-level portion of the touch scanning signal does not have the voltage change, the electromagnetic interference is not generated, so that the display timing and the touch timing of the display screen can be separated from each other by setting the rising edge and the falling edge of the touch scanning signal outside the time period of the level duration corresponding to the display data in the display data signal, that is, setting the rising edge and the falling edge of the touch scanning signal within the time period of the first level duration of the row synchronizing signal, thereby preventing the touch scanning signal of the display screen from generating the electromagnetic interference on the display process of the display screen, and improving the display quality of the display screen.
The following describes aspects of the present application using exemplary embodiments.
Exemplarily, as shown in fig. 4, an implementation flow diagram of a display driving method of a display screen provided in an embodiment of the present application is shown. The display driving method of the display screen can be applied to a DDIC of the display screen with a touch function, and is executed by the DDIC of the display screen, and comprises the following steps 401 to 402.
Step 401 generates a line synchronization signal, a display scan signal, and a display data signal.
In this embodiment, the level duration corresponding to the display data in the display data signal is within the active level duration of the display scan signal.
Wherein, the level duration corresponding to the display data in the display data signal is within the active level duration of the display scan signal, and the following two situations may be included:
first, a level duration period corresponding to display data in the display data signal coincides with an active level duration period of the display scan signal.
That is, as shown in fig. 3, the level start time corresponding to the display data in the display data signal coincides with the start time of the active level of the display scan signal, and the level end time corresponding to the display data in the display data signal coincides with the end time of the active level of the display scan signal.
Second, a level duration period corresponding to display data in the display data signal is smaller than an active level duration period of the display scan signal.
That is, the level start time corresponding to the display data in the display data signal is later than the start time of the active level of the display scan signal, and the level end time corresponding to the display data in the display data signal is earlier than the end time of the active level of the display scan signal.
It should be noted that, as the resolution of the display screen is higher and higher, the charging time of the pixels is expected to be longer and safer to ensure that the display screen can ensure the display image quality when displaying a highlight picture, so that, in practical application, the level duration corresponding to the display data in the display data signal can be overlapped with the effective level duration of the display scanning signal to meet the charging requirement of the display screen.
For convenience of description, the following describes an exemplary embodiment of the present application by taking an example in which a level duration corresponding to display data in a display data signal is overlapped with an active level duration of a display scan signal.
In the embodiment of the present application, the active level duration period of the row sync signal includes a first level duration period and a second level duration period, which are consecutive, the first level duration period being separated from (i.e., not overlapping with) the active level duration period of the display scan signal, and the second level duration period being coincident with the active level duration period of the display scan signal.
In the embodiment of the application, the duration time of the active level of the Hsync signal indicates that the signal received by the display screen belongs to the signal of the same row of pixels in the time period; and displaying the active level duration time period of the scanning signal, wherein the data scanning line charges the sub-pixels in the same row in the time duration time period.
Step 402, sending the line synchronization signal to a touch driving chip TPIC of the display screen, so that the TPIC generates a touch scanning signal according to the line synchronization signal.
As shown in fig. 3, the rising edge and the falling edge of the touch scan signal generated by the TPIC according to the row sync signal are both within the first level duration period of the row sync signal, that is, outside the level duration period corresponding to the display data in the display data signal.
In the related art, to increase the speed of image display, the display data lines S1-S7 shown in fig. 1 are usually precharged, i.e., a part of the time is reserved for the display data lines to be used for pre-climbing, so that the sub-pixels can be charged immediately after the TFT of each sub-pixel is turned on.
Accordingly, the DDIC generates a display data signal in which a level duration period corresponding to the display data differs from an active level duration period of the display scan signal by a precharge time interval, i.e., the level duration period corresponding to the display data in the display data signal does not completely coincide with the active level duration period of the display scan signal. However, in this case, the active level duration period of the line synchronization signal generated by the DDIC coincides with the level duration period corresponding to the display data in the display data signal.
For example, as shown in fig. 5, the level duration period corresponding to the display data in the display data signal generated by the DDIC only partially overlaps with the active level duration period of the display scan signal, and the level duration period that does not overlap with the active level duration period of the display scan signal in the level duration period corresponding to the display data of the display data signal is the precharge level duration period in the display data signal. Furthermore, the line synchronizing signal generated by the DDIC and the display data signal belong to a synchronizing signal, that is, the active level duration period of the line synchronizing signal completely coincides with the level duration period corresponding to the display data in the display data signal.
In addition, at present, in order to avoid the touch scan signal of the display screen from being interfered by other electrical components (for example, the NFC chip), the signal start time of the touch scan signal needs to be located in the display data signal for the duration of the precharge level, that is, the rising edge of the touch scan signal needs to be located in the display data signal for the duration of the precharge level, so that the touch scan signal and the display data signal are electromagnetically interfered with each other due to signal overlap (the rising edge of the touch scan signal overlaps the display data signal for the duration of the precharge level).
Based on this, in order to avoid electromagnetic interference between the touch scan signal and the display data signal due to signal overlap, in this embodiment of the application, as shown in fig. 3, through the above step 401, the level duration period corresponding to the display data in the display data signal generated by the DDIC is located within the active level duration period of the display scan signal, for example, the pre-charging process to the display data line is turned off, and the level duration period corresponding to the display data in the display data signal is located within the active level duration period of the display scan signal.
Meanwhile, as shown in fig. 3, in the above step 402, the line synchronization signal is sent to the TPIC of the display screen, so that the TPIC generates the touch scanning signal whose rising edge and falling edge are both located in the first level duration period of the line synchronization signal according to the line synchronization signal, so that the display timing sequence and the touch timing sequence of the display screen are separated from each other, thereby avoiding the touch scanning signal of the display screen from generating electromagnetic interference to the display process of the display screen, and further improving the display quality of the display screen.
Specifically, as shown in fig. 3, the active level duration period of the row sync signal may include a first level duration period and a second level duration period which are consecutive.
The first level duration period of the line sync signal is separated from the active level duration period of the display scan signal, and the second level duration period of the line sync signal overlaps with the active level duration period of the display scan signal. Meanwhile, the level duration period corresponding to the display data in the display data signal is positioned in the effective level duration period of the display scanning signal, so that the first level duration period and the level duration period corresponding to the display data of the display data signal are separated from each other.
Therefore, through the above step 402, when the TPIC sends the row sync signal to the TPIC of the display screen, and generates the touch scan signal according to the row sync signal, where the rising edge and the falling edge of the touch scan signal are both located within the first level duration period of the row sync signal, the rising edge and the falling edge of the touch scan signal are both located within the precharge level duration period of the display data signal, and the precharge process of the display data line is closed at this time, so that the rising edge and the falling edge of the touch scan signal can both be located outside the level duration period corresponding to the display data in the display data signal.
In addition, because the time interval corresponding to the rising edge and the falling edge of the touch scanning signal belongs to the time interval in which the voltage changes, the time interval is the main time interval in which the electromagnetic interference is generated, and the high-level part of the touch scanning signal does not have the voltage change, the electromagnetic interference is not generated, so that the display time sequence and the touch time sequence of the display screen can be separated by setting the rising edge and the falling edge of the touch scanning signal outside the time interval of the level duration corresponding to the display data in the display data signal, that is, setting the rising edge and the falling edge of the touch scanning signal in the first time interval of the row synchronizing signal, the electromagnetic interference generated by the touch scanning signal of the display screen to the display process of the display screen is avoided, and the display quality of the display screen is improved.
In the embodiment of the present application, the active level is a level signal that can trigger a lower circuit, and the active level of the normal line synchronization signal is a high level. It is to be understood that, in some embodiments of the present application, the active level of the line synchronization signal may also be a low level, which is not limited by the present application.
For convenience of explanation, as shown in fig. 3, the present application exemplifies that the active level of the row sync signal is a high level, that is, the active level duration period of the row sync signal is a level duration period corresponding to the high level in the row sync signal.
Similarly, in the embodiment of the present application, the active level of the display data signal may be a high level or a low level.
Optionally, in some embodiments of the present application, in the process of generating the display data signal in step 401, in order to enable a level duration period corresponding to the display data in the display data signal to be within an active level duration period of the display scan signal, the precharge process for the display data line needs to be turned off.
Alternatively, in some embodiments of the present application, the closing of the precharge process on the display data line may be implemented in the following manner of step a01 or step a 02.
Step a01, if the active level of the display data signal is a high level, setting a level corresponding to a precharge level duration period in the display data signal as a low level. Wherein the precharge level duration period overlaps the first level duration period.
Step a02, if the active level of the display data signal is a low level, setting a level corresponding to a precharge level duration period in the display data signal as a high level.
For example, the turning off of the precharge process of the display data line is realized by setting the level of the display data signal to a low level or a high level when the rising edge of the row sync signal is detected until a time interval corresponding to the precharge level duration period in the display data signal is reached.
The time interval corresponding to the duration time of the pre-charging level can be obtained by searching a chip manual of the display screen. In practical applications, the duration of the precharge level for a display screen with the highest refresh rate of 120Hz corresponds to a time interval of 0.7us.
In this embodiment, when the effective level of the display data signal is a high level, the level corresponding to the duration of the precharge level in the display data signal is set to a low level, and when the effective level of the display data signal is a low level, the level corresponding to the duration of the precharge level in the display data signal is set to a high level, so that the closing of the duration of the precharge level in the display data signal is realized, so that the duration of the level corresponding to the display data in the display data signal is within the duration of the effective level of the display scan signal, and further, when the TPIC generates the touch scan signal in which both the rising edge and the falling edge are within the first duration of the level of the line sync signal according to the line sync signal, both the rising edge and the falling edge of the touch scan signal can be located outside the duration of the level corresponding to the display data in the display data signal, thereby realizing the mutual separation of the display timing and the touch timing of the display screen, avoiding the touch scan signal of the display screen from generating electromagnetic interference to the display process of the display screen, and improving the display quality of the display screen.
In the embodiment of the present application, when the display screen performs image refresh by using multiple refresh rates, or performs image refresh by using a dynamic frequency conversion technology, in order to reduce the influence of refresh rate change on display screen parameters, the DDIC needs to keep the image scanning speed unchanged, that is, the time for scanning a line is unchanged, the time for completing image scanning of one frame is unchanged, and only the Vertical interval (Vporch) is extended. For example, when the display screen refresh rate supports 60Hz, 90Hz, and 120Hz, and the display resolution of the display screen is 1440 × 3216, each frame of image scanning is completed within 8.3ms (the duration of a single frame of image scanning at the highest refresh rate), and the time for scanning one line is 8.3ms/3216=2.6 μ s.
That is, the signal frequency of the line synchronization signal is not changed by the change of the refresh rate of the display panel, but calculated based on the maximum refresh rate of the DDIC and the display resolution of the display panel. For example, if the maximum refresh rate of the display DDIC is 120Hz and the display resolution of the display is 1440 × 3216, the signal frequency of the line synchronization signal is: 120 × 3216=385920hz.
Therefore, in the embodiment of the present application, by sending the row synchronization signal to the TPIC, when the TPIC performs touch scanning based on the touch scanning signal generated by the row synchronization signal, the TPIC is not affected by the change of the refresh rate of the display screen, and thus, the method and the device can be applied to a display screen that performs image refresh by using multiple refresh rates or performs image refresh by using a dynamic frequency conversion technology.
In an exemplary embodiment, a touch driving method of a display screen is further provided. The touch driving method of the display screen can be applied to a touch driving chip TPIC of the display screen with a touch function, and is executed by the TPIC of the display screen, as shown in fig. 6, and the touch driving method can include the following steps 601 to 602.
Step 601, receiving a line synchronization signal sent by a DDIC of a display screen.
In the embodiment of the present application, as shown in fig. 3, the active level duration period of the row sync signal includes a first level duration period and a second level duration period, the first level duration period is separated from the active level duration period of the display scan signal generated by the display driver chip, the second level duration period coincides with the active level duration period of the display scan signal, and the level duration period corresponding to the display data in the display data signal generated by the display driver chip is within the active level duration period of the display scan signal.
Step 602, a touch scanning signal is generated according to the line synchronization signal.
In the embodiment of the present application, as shown in fig. 3, both the rising edge and the falling edge of the touch scan signal are located within the first level duration of the row sync signal.
In the embodiment of the application, the TPIC receives the line synchronization signal that the first level duration generated by the DDIC is separated from the effective level duration of the display scanning signal, and the second level duration coincides with the effective level duration of the display scanning signal, and generates the touch scanning signal whose rising edge and falling edge are both located in the first level duration of the line synchronization signal according to the line synchronization signal, so that the display timing sequence and the touch timing sequence of the display screen are separated from each other, so that the DDIC does not suffer interference from the touch scanning signal generated by the TPIC when performing image display based on the display scanning signal and the display data signal, and the display quality of the display screen is improved.
Specifically, because the time periods corresponding to the rising edge and the falling edge of the touch scanning signal belong to the time periods in which the voltage changes, the time periods are the main time periods in which the electromagnetic interference is generated, and the high-level portion of the touch scanning signal does not have the voltage change, the electromagnetic interference is not generated, so that the display timing and the touch timing of the display screen can be separated from each other by setting the rising edge and the falling edge of the touch scanning signal outside the time period of the level duration corresponding to the display data in the display data signal, that is, setting the rising edge and the falling edge of the touch scanning signal within the time period of the first level duration of the row synchronizing signal, thereby preventing the touch scanning signal of the display screen from generating the electromagnetic interference on the display process of the display screen, and improving the display quality of the display screen.
In the embodiment of the present invention, since the rising edge and the falling edge of the touch scan signal are both located in the first level duration of the line synchronization signal, the signal frequency of the touch scan signal needs to be less than or equal to the line synchronization signal, and the signal frequency of the touch scan signal is 1/K of the signal frequency of the line synchronization signal, where K is an integer greater than or equal to 1.
For example, the signal frequency of the touch scan signal shown in fig. 3 is 1/2 of the signal frequency of the line synchronization signal.
In this embodiment of the application, the rising edge and the falling edge of the touch scan signal both being located in the first level duration of the row sync signal may refer to: the rising edge of the touch scan signal coincides with or is later than a signal start time of the row sync signal (i.e., a start time of the first level duration period), and the falling edge of the touch scan signal coincides with or is earlier than a signal end time of the row sync signal (i.e., an end time of the first level duration period).
Optionally, in some embodiments of the present application, in order to ensure the charging duration of the touch electrode and avoid the problem of low response sensitivity of the display screen, in step 602, the touch scanning signal is generated according to the line synchronization signal, and the touch scanning signal whose signal frequency is one fourth of the signal frequency of the line synchronization signal is generated according to the line synchronization signal.
Wherein, the signal frequency of the line synchronizing signal is calculated based on the highest refresh rate of the DDIC and the display resolution of the display screen.
For example, if the maximum refresh rate of the display DDIC is 120Hz and the display resolution of the display is 1440 × 3216, the signal frequency of the line synchronization signal is: 120 × 3216=385920hz, and the signal frequency of the touch scan signal generated according to the line sync signal may be: 385920/4=96480Hz.
Optionally, in some embodiments of the present application, in order to ensure that the rising edge of the touch scan signal is located within the first level duration period of the row sync signal, in step 602, the touch scan signal is generated according to the row sync signal, which may be implemented by: delaying for a preset time length after detecting the rising edge of the line synchronization signal to generate the touch scanning signal; the preset duration is less than or equal to a time interval corresponding to a first level duration, that is, less than or equal to a time interval corresponding to the precharge level duration.
For example, if the time interval corresponding to the precharge level duration period is 0.7 μ s, the preset time period is less than or equal to 0.7 μ s.
In the embodiment of the application, after the rising edge of the line synchronization signal is detected, a preset time duration is delayed, and the touch scanning signal is generated again, so that the preset time duration is spaced between the rising edge of the line synchronization signal and the rising edge of the touch scanning signal, and the rising edge of the touch scanning signal is ensured to be located in the first level duration, in addition, the signal frequency of the touch scanning signal is set to be 1/K of the signal frequency of the line synchronization signal, wherein K is an integer greater than or equal to 1, so that the falling edge of the touch scanning signal can also be located in the first level duration of the line synchronization signal, and further, the rising edge and the falling edge of the touch scanning signal are both located in the first level duration of the line synchronization signal, thereby realizing the mutual separation of the display time sequence and the touch time sequence of the display screen, avoiding the touch scanning signal of the display screen from generating electromagnetic interference on the display process of the display screen, and improving the display quality of the display screen.
It should be noted that fig. 3 and fig. 5 are only exemplary signal timing diagrams provided in the implementation of the present application, and in practical applications, rising edges and falling edges of the above-mentioned various signals are not vertical, but there are a certain ramp-up time and a ramp-down time.
For example, as shown in fig. 7, rising edges of the row sync signal and the touch scan signal do not rise vertically, but rise from a low level to a high level for a certain period of time; similarly, the falling edges of the row sync signal and the touch scan signal do not fall vertically, but fall from a high level to a low level within a certain period of time.
While, for purposes of simplicity of explanation, the foregoing method embodiments are described as a series of acts or combinations, it will be appreciated by those of ordinary skill in the art that the present application is not limited by the illustrated ordering of acts, as some steps may occur in other orders in some embodiments of the application.
In an exemplary embodiment, a display driver chip DDIC is further provided, where the DDIC is configured on a display screen with a touch function, and is configured to:
when the display screen is in a working state, generating a display scanning signal, a display data signal and a line synchronization signal; the level duration corresponding to the display data in the display data signal is positioned in the effective level duration of the display scanning signal; the active level duration period of the row sync signal includes a first level duration period and a second level duration period which are consecutive, the first level duration period being separated from the active level duration period of the display scan signal, the second level duration period coinciding with the active level duration period of the display scan signal;
sending the line synchronization signal to a touch driving chip TPIC of the display screen so as to generate a touch scanning signal by the TPIC according to the line synchronization signal; the rising edge and the falling edge of the touch scanning signal are both located in the first level duration time of the row synchronizing signal.
Optionally, in some embodiments of the application, the DDIC, when generating the display data signal, is configured to:
if the effective level of the display data signal is a high level, setting the level corresponding to the duration of the pre-charging level in the display data signal as a low level;
if the effective level of the display data signal is low level, setting the level corresponding to the duration time of the pre-charging level in the display data signal as high level;
wherein the precharge level duration period overlaps the first level duration period.
Optionally, in some embodiments of the application, the signal frequency of the line synchronization signal is calculated based on a maximum refresh rate of the display driver chip and a display resolution of the display screen.
In an exemplary embodiment, a TPIC configured on a display screen with a touch control function is further provided, and configured to:
receiving a line synchronization signal sent by a display driving chip of a display screen; the active level duration time period of the row synchronizing signal comprises a first continuous level duration time period and a second continuous level duration time period, the first continuous level duration time period is separated from the active level duration time period of the display scanning signal generated by the display driving chip, the second continuous level duration time period is overlapped with the active level duration time period of the display scanning signal, and the level duration time period corresponding to the display data in the display data signal generated by the display driving chip is positioned in the active level duration time period of the display scanning signal;
generating a touch scanning signal according to the line synchronization signal, and performing touch scanning of the display screen according to the touch scanning signal; the rising edge and the falling edge of the touch scanning signal are both located in the first level duration period of the row synchronizing signal.
Optionally, in some embodiments of the present application, when the TPIC generates the touch scan signal according to the row synchronization signal, the TPIC is configured to:
generating a touch scanning signal with a signal frequency which is one fourth of the signal frequency of the line synchronizing signal according to the line synchronizing signal; the signal frequency of the line synchronizing signal is calculated based on the highest refresh rate of the display driving chip and the display resolution of the display screen.
Optionally, in some embodiments of the present application, when the TPIC generates the touch scan signal according to the row synchronization signal, the TPIC is configured to:
delaying for a preset time length after detecting the rising edge of the line synchronization signal to generate a touch scanning signal; and the preset duration is less than or equal to the time interval corresponding to the first level duration.
It should be noted that, for convenience and simplicity of description, the specific working processes of the display driver chip and the touch driver chip described above may refer to corresponding processes of the above method embodiments, and are not described herein again.
In an exemplary embodiment, a display screen is further provided, where the display screen is configured with a DDIC and a TPIC, the DDIC is connected to the TPIC, the DDIC is configured to implement the steps of the display driving method in each of the above embodiments, and the TPIC is configured to implement the steps of the touch driving method in each of the above embodiments, and the display screen displays an image based on the display scanning signal, the display data signal, and the line synchronization signal, and implements a touch function based on the touch scanning signal.
For example, the embodiment of the present application further provides a terminal, which may be a mobile phone, a tablet computer, an in-vehicle device, an Augmented Reality (AR)/Virtual Reality (VR) device, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a Personal Digital Assistant (PDA), or the like, and which includes a display screen with a touch function.
As shown in fig. 8, the terminal may include a processor 81, a memory 82, and a display screen 83 configured with a DDIC and a TPIC, where the processor is connected with the DDIC and the TPIC respectively, the DDIC is connected with the TPIC, the DDIC is used for implementing the steps of the display driving method in the foregoing embodiments, and the TPIC is used for implementing the steps of the touch driving method in the foregoing embodiments.
In the embodiment of the present application, the processor 81 may include one or more processing cores. The processor 81 connects various parts within the overall terminal 80 using various interfaces and lines, and performs various functions of the terminal 80 and processes data by executing or executing instructions, programs, code sets, or instruction sets stored in the memory 82, and calling data stored in the memory 82.
The display screen 83 is a display unit for displaying an image, and is generally provided on the front panel of the terminal 80. The display screen 83 may be designed as a full-face screen, curved screen, contoured screen, double-face screen, or folding screen. The display screen 83 may also be designed as a combination of a full screen and a curved screen, and a combination of a special screen and a curved screen, which is not limited in this embodiment.
In the embodiment of the present application, the display screen 83 includes a DDIC 831, a display panel 832, and a TPIC833. Optionally, the display screen 83 may be an OLED display screen, which may be a Low Temperature Polysilicon (LTPS) AMOLED display screen or a Low Temperature Polysilicon Oxide (LTPO) AMOLED display screen.
The DDIC 831 is used to drive the display screen 83 for image display, and the DDIC is used to realize the display driving method in each of the embodiments described above. In addition, the DDIC is connected to the processor through an MIPI interface, and is configured to receive image data and instructions sent by the processor.
The TPIC833 is used to receive a touch operation, which is triggered by a user using a finger, a touch pen, or any other suitable object. In this embodiment, the TPIC833 is further electrically connected to the DDIC 831, and is configured to receive the column synchronization signal sent by the DDIC 831, so as to implement the touch driving method in each of the embodiments. In addition, the TPIC is also connected with the processor through an MIPI interface and used for reporting the touch signals to the processor.
In addition, those skilled in the art will appreciate that the configuration of the terminal 80 illustrated in the above-described figures does not constitute a limitation of the terminal 80, and that the terminal may include more or less components than illustrated, or some components may be combined, or a different arrangement of components. For example, the terminal 80 further includes a microphone, a speaker, a radio frequency circuit, an input unit, a sensor, an audio circuit, a Wireless Fidelity (WiFi) module, a power supply, a bluetooth module, and other components, which are not described herein again.
By way of example, embodiments of the present application further provide a computer-readable storage medium, where a computer program is stored, and when the computer program is executed, the steps of the display driving method and the steps of the touch driving method of the display screen in the foregoing embodiments are implemented. It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of each functional unit is illustrated, and in practical applications, the above-mentioned functional allocation may be performed by different functional units or modules according to requirements, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working processes of the units and modules in the system may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the display driving method of the display screen, the specific application of the touch driving method, and design constraints. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/user terminal and method may be implemented in other ways. For example, the above-described apparatus/user terminal embodiments are merely illustrative, and for example, a division of modules or units is only one logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated modules/units, if implemented in the form of software functional units and sold or used as separate products, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow in the method of the embodiments described above can be realized by a computer program, which can be stored in a computer readable storage medium and used to instruct related hardware, and when the computer program is executed by a processor, the steps of the method embodiments described above can be realized. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, read-Only Memory (ROM), random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
The above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some of the method features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims (10)

1. A display driving method of a display screen is characterized in that the display driving method is applied to a display driving chip of the display screen, and the display driving method comprises the following steps:
generating a display scanning signal, a display data signal and a line synchronization signal; wherein, the level duration corresponding to the display data in the display data signal coincides with the active level duration of the display scanning signal; the active level duration period of the row sync signal includes a first level duration period and a second level duration period which are consecutive, the first level duration period being separated from the active level duration period of the display scan signal, the second level duration period coinciding with the active level duration period of the display scan signal;
sending the line synchronization signal to a touch driving chip of the display screen so that the touch driving chip generates a touch scanning signal according to the line synchronization signal; the rising edge and the falling edge of the touch scanning signal are both positioned in a first level duration period of the row synchronizing signal;
the generation of the display data signal comprises:
if the effective level of the display data signal is high level, setting the level corresponding to the duration time of the pre-charging level in the display data signal as low level;
if the effective level of the display data signal is low level, setting the level corresponding to the duration time of the pre-charging level in the display data signal as high level;
wherein the precharge level duration period coincides with the first level duration period.
2. The display driving method according to claim 1, wherein the signal frequency of the line synchronization signal is calculated based on a maximum refresh rate of the display driving chip and a display resolution of the display screen.
3. A touch driving method of a display screen is characterized by being applied to a touch driving chip of the display screen, and the touch driving method comprises the following steps:
receiving a line synchronization signal sent by a display driving chip of the display screen; wherein the active level duration period of the row synchronization signal includes a first level duration period and a second level duration period which are consecutive, the first level duration period is separated from the active level duration period of the display scanning signal generated by the display driving chip, the second level duration period coincides with the active level duration period of the display scanning signal, and the level duration period corresponding to the display data in the display data signal generated by the display driving chip coincides with the active level duration period of the display scanning signal;
generating a touch scanning signal according to the line synchronization signal; the rising edge and the falling edge of the touch scanning signal are both positioned in a first level duration period of the row synchronizing signal;
the generation of the display data signal comprises:
if the effective level of the display data signal is high level, setting the level corresponding to the duration time of the pre-charging level in the display data signal as low level;
if the effective level of the display data signal is low level, setting the level corresponding to the duration time of the pre-charging level in the display data signal as high level;
wherein the precharge level duration period coincides with the first level duration period.
4. The touch driving method according to claim 3, wherein the generating a touch scanning signal according to the row synchronization signal comprises:
generating a touch scanning signal with a signal frequency being one fourth of the signal frequency of the line synchronizing signal according to the line synchronizing signal; and calculating the signal frequency of the line synchronization signal based on the highest refresh rate of the display driving chip and the display resolution of the display screen.
5. The touch driving method according to claim 3 or 4, wherein the generating a touch scanning signal according to the row synchronization signal comprises:
delaying for a preset time after detecting the rising edge of the line synchronizing signal, and generating the touch scanning signal; wherein the preset duration is less than or equal to the first level duration.
6. A display driver chip, wherein the display driver chip is configured on a display screen, and the display driver chip is configured to:
generating a display scanning signal, a display data signal and a line synchronization signal; wherein, the level duration corresponding to the display data in the display data signal coincides with the active level duration of the display scanning signal; the active level duration period of the row sync signal includes consecutive first and second level duration periods, the first level duration period being separated from the active level duration period of the display scan signal, the second level duration period coinciding with the active level duration period of the display scan signal;
sending the line synchronization signal to a touch driving chip of the display screen so that the touch driving chip generates a touch scanning signal according to the line synchronization signal; the rising edge and the falling edge of the touch scanning signal are both positioned in a first level duration period of the row synchronizing signal;
the generation of the display data signal comprises:
if the effective level of the display data signal is high level, setting the level corresponding to the duration time of the pre-charging level in the display data signal as low level;
if the effective level of the display data signal is low level, setting the level corresponding to the duration time of the pre-charging level in the display data signal as high level;
wherein the pre-charge level duration period coincides with the first level duration period.
7. The touch driving chip is configured on a display screen, and is configured to:
receiving a line synchronization signal sent by a display driving chip of the display screen; the active level duration time period of the row synchronizing signal comprises a first continuous level duration time period and a second continuous level duration time period, the first continuous level duration time period is separated from the active level duration time period of the display scanning signal generated by the display driving chip, the second continuous level duration time period is coincident with the active level duration time period of the display scanning signal, and the level duration time period corresponding to the display data in the display data signal generated by the display driving chip is coincident with the active level duration time period of the display scanning signal;
generating a touch scanning signal according to the line synchronization signal; the rising edge and the falling edge of the touch scanning signal are both positioned in a first level duration period of the row synchronizing signal;
the generation of the display data signal comprises:
if the effective level of the display data signal is high level, setting the level corresponding to the duration time of the pre-charging level in the display data signal as low level;
if the effective level of the display data signal is a low level, setting a level corresponding to a precharge level duration period in the display data signal as a high level;
wherein the precharge level duration period coincides with the first level duration period.
8. A display screen, characterized in that, the display screen is configured with a display driving chip and a touch driving chip, the display driving chip is connected with the touch driving chip, the display driving chip is used for implementing the display driving method according to any one of claims 1 to 2, the touch driving chip is used for implementing the touch driving method according to any one of claims 3 to 5, the display screen displays an image based on the display scanning signal, the display data signal and the line synchronization signal, and implements a touch function based on the touch scanning signal.
9. A terminal, characterized in that the terminal comprises a processor and a display screen configured with a display driver chip and a touch driver chip, the processor is respectively connected with the display driver chip and the touch driver chip, the display driver chip is connected with the touch driver chip, the display driver chip is used for implementing the display driving method according to any one of claims 1 to 2, and the touch driver chip is used for implementing the touch driving method according to any one of claims 3 to 5.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed, implements the steps of the method according to any one of claims 1-5.
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